Grate-bar.



Patented June 28,1910.

ZNVENTOR A. WILDBRSPIN.

GRATE BAR.

APPLIOATION FILEDMAR.17, 1910.

WITNESSES I l N TED ANDERSON WILDERSPIN, OF GRAND SALINE, TEXAS,ASSIGNOR OF ONE-HALF TO DAVID C. EARNEST, OF DALLAS, TEXAS.

GRATE-BAR.

Specification of Letters Patent.

Patented June 28, 1910.

Application filed March-17, 1910. Serial No. 549,942.

To all whom it may concern.-

Be it known that I, ANDERSON WILDER- SPIN, a citizen of the UnitedStates of America, and a resident of Grand Saline, in the county of VanZandt, in the State of Texas, have invented certain new and usefulImprovements in Grate-Bars, whereof the following is a specification.

This invention relates to a furnace grate bar especially adapted for agrate for burning fine fuel such as slack lignite in steam boiler orother furnaces, either with a natural, a forced or an induced draft.These grate bars may also be used to advantage in burning lump ligniteand other fuel.

The principal objects of the inventionare to secure a thoroughdistribution of air to the fuel on the grate and the retention thereonafter a rake off of sufficient incandescent fuel to ignite a freshsupply of fuel.

Figure 1 of the accompanying drawings represents an enlarged transversesection on line 1 1 of Fig. 2 of a grate bar embodying the principalfeatures of this invention. Fig. 2 represents a top plan View thereof, apart being broken out. Fig. 3 represents a bottom plan view of afragment thereof. Fig. 4 represents a perspective view of a fragmentthereof provided with ventilating holes extending through the partitionsand with ventilating channels in its sides. Fig. 5 represents atransverse section of a portion of a grate comprising a series of gratebars embodying the principal features of this invention. Fig. 6represents a longitudinal section of a fragment of one end of one of thegrate bars and its furnace support.

The same reference numbers indicate cor responding parts in all thefigures.

This bar in its general outline is like the ordinary grate bar commonlyused in boiler furnaces being approximately rectangular in crosssection, wider at top than bottom, and provided at its opposite endswith flanges 11 and 12 or other suitable projec tions for engagingsupporting means.

A. grate bar embodying the preferred form of this invention is providedon its top face with marginal ribs 18 and transverse ribs or partitions13 forming a plurality of individual fuel pockets 20 adapted to retainfine fuel, and on its bottom face with recesses forming air pockets 25preferably corresponding to the fuel pockets 20. The

transverse partitions 13 on the top face of the bar and'the transversepartitions 14 on the bot-tom face thereof are preferably diagonal. Thesefuel pockets are preferably about one-half to five-eighths of an inchdeep, more or less. The fuel pockets 20 are connected with the airpockets 25 by'ventilating holes 15 preferably tapering and largest attheir lower ends, being preferably about three eighths of an inch indiameter at the top and fifty per cent. larger at the bottom. Theseholes may be arranged in sets of two disposed apart from each other, theholes of one set being opposite the spaces between the holes of theadjacent set or sets. The grate bar may also be provided wit-h taperingventilating holes 16 which open flush with the top and bottom faces ofthe bar and pass through the marginal rims or ribs 18 thereof or throughthe diagonal partitions or ribs.

The grate bar may be provided on one or both sides with channels 17adapted to form with corresponding channels on an adjacent bar or barsadditional ventilating holes.

In the use of these grate bars they are disposed together in touch onewith another on ledges 30 or other suitable supports within the fire boxas shown in Figs. 5 and 6.

The tapering form of the ventilating holes tends to cause a discharge ofthe air in jets into the fuel. When the fire is raked, the marginal rimand cross partitions or ribs cause the scraper or rake to pass over theincandescent fuel in the pockets and said fuel serves to ignite thefresh lignite or other fuel with which the fire is replenished. Thediagonal direction of these ribs permits the rake to pass Withoutobstruction.

In ordinary grates especially where a forced or induced draft is used,there is a tendency of the air to rush through the weakest places in thefire. In a grate composed of this improved grate bar the individual airpockets underneath tend to prevent the air rushing past some of theventilating holes and overcharging others. These air pockets formseparate sources of supply to the separate groups of ventilating holesand cause an even distribution of the air to the fuel pockets in the topof the bar throughout the grate surface.

I claim as my invention 1. A grate bar provided on its top face withmarginal ribs and transverse partitions forming a plurality ofindividual fuel pockets adapted to retain fine fuel, said bar hav ingventilating holes extending through the body thereof and opening intosaid pockets.

2. A grate bar provided on its top face with marginal ribs and diagonaltransverse partitions forming a plurality of individual fuel pocketsadapted to retain fine fuel, said bar having ventilating holes extendingthrough the body thereof and opening into said pockets.

3. A grate bar provided with individual fuel pockets in its top face,separated by transverse partitions, individual air pockets on its bottomface and ventilating holes connecting said pockets.

4. A grate bar provided with individual fuel pockets in its top face,separated by transverse partitions, individual air pockets in its bottomface and upwardly tapering ventilating holes connecting said pockets.

5. A grate bar provided with individual fuel pockets in its top face,separated by transverse partitions, corresponding individual air pocketson its bottom face and ventilating holes connecting said pockets.

(3. A grate bar provided with individual fuel pockets in its top face,separated by transverse partitions, with ventilating holes extendingthrough the body of said bar and opening into said pockets and withventilating holes extending through the body of said bar and openingflush with the top face thereof.

7. A grate bar provided with individual fuel pockets in its top face,separated by transverse partitions, with ventilating holes extendingthrough the body of said bar and opening into said pockets and withventilating holes extending through the body of said bar and through theseparating partitions between said pockets and opening flush with thetop face thereof.

8. A grate bar provided with individual fuel pockets in its top faceseparated by transverse partitions, and with ventilating holes extendingthrough the body of said bar and opening into said pockets, said barbeing provided with air channels in its side adapted to form ventilatingholes with corresponding air channels on an adjacent grate bar.

9. A grate bar provided with individual fuel pockets in its top faceseparated by transverse partitions, with individual air pockets in itsbottom face, with ventilating holes connecting said pockets, and withventilating holes extending through the body of said bar and openingflush with the top face thereof.

10. A grate bar provided with individual fuel pockets in its top faceseparated by transverse partitions, with individual air pockets in itsbottom face, with ventilating holes connecting said pockets, and withventilating holes extending through the body of said bar and through theseparating partitions between said fuel pockets.

11. A grate bar provided with individual fuel pockets in its top faceseparated by transverse partitions, with individual air pockets in itsbottom face, with ventilating holes connecting said pockets, and withventilating holes extending through the body of said bar and openingflush with the top face thereof, said bar being provided with airchannels in its side adapted to form ventilating holes withcorresponding air channels on an adjacent grate bar.

12. A grate bar provided with individual fuel pockets in its top faceseparated by transverse partitions, with individual air pockets in itsbottom face separated by transverse partitions, with ventilating holesconnecting said pockets, and with ventilating holes extending throughthe body of said bar and through the separating partitions between saidpockets and opening flush with the top face thereof, said bar beingprovided with air channels in its side adapted to form ventilating holeswith corresponding. air channels on an adjacent grate bar.

ANDERSON WILDERSPIN.

WVitnesses:

F. B. Mnnns, JAs. KIRK.

